Recent Posts
-
Java – add string value
Here is the Java problem: Solution String str = "abcde"; String str = "abcde"; System.out.println(getIncrementedString…… -
If HashMap Java exists, it gets the value
I want to get a value from hasmap, but sometimes the value does not exist, so I did this: int var = 0; if (hashMapHous…… -
How do I round numbers in Java?
For this program, I write the number of minutes I am accepting user input, and then round it to the next hour >1 mi…… -
Java – try to parse the date time in PDT into zoneddatetime representation
How can I parse the date time value in the PDT time zone? 06/24/2017 07:00 AM (PDT) I want to maintain time zones so t…… -
Java – how’s it going? Listening location setting is turned on (android app)
So I spent weeks working on my Android application and studying the best way to achieve what I need to do, but I still…… -
Java – wicket – which ORM?
I am looking for an ORM that is easy to use and integrated for wicket applications I'm thinking about hibernate Is thi…… -
Java – variables are instantiated in kotlin only when kotlin is empty?
It can be said that I have a variable: var myObject：MyObject？ = null It should be cleared somewhere: myObject?.clear…… -
Why does the Java ArrayList class return a Boolean value to add?
My teacher gave me this analogy to the method I was writing I still don't understand why the add method returns a Bool…… -
Java – even in flush()/. Filewriter will not write to the file after close()
I tried to write a text file, but even if the method creates the file, if it doesn't exist, it won't write I have pass…… -
Verify the URL in Java
Who knows how to use regular expressions to verify the URL format in Java? thank you Solution A very sneaky way is: tr…… -
Java – Method override
class A class A { int i=10; void show() { System.out.println("class A"); } } class B extends A { int i=…… -
Java – similar to camera Parameters. Gethorizontalviewangle() and camera Parameters. What is the Android Camera2 API of getverticalviewangle()?
All this is in the title, but in the now deprecated Android camera API, there are two methods: camera Parameters. Geth…… -
Lambda – converts the string list to a sorted map string length as the key
I have a list < string > and I have to convert it into a map. By grouping strings of the same length into a list…… -
Java 8 – restrict the flow of the first object and convert it to a specific object?
I used earlier: List<Person> person = UserDB.getUserDetails(); Person p = person.get(0); // index of first posit…… -
Java – what are the uses of objects of type object
I saw the code below the exercise in the scjp book Object obj = new Object(); First of all, I think this may be a mist…… -
java – Collectors. Set implementation in toset()?
See English answers > what is default set / list implementation with collectors in Java 8 stream API? 1 Stream.of(1…… -
How can I disable a node without graying it out in JavaFX?
My problem is that I can disable nodes so that users cannot interact with them when printing However, for the same rea…… -
Java arithmetic
Why does this code return the wrong value? int i=Integer.MAX_VALUE+1; long l=Integer.MAX_VALUE+1; System.out.println(l…… -
Java – wait(), notify() – which thread is unlocked first?
Try to understand wait() and notify() I know when thread a enters wait (). It will be awakened by notify () from other…… -
Java – save values in a loop
I'm trying to read the value of my country array string, which reads CSV files InputStreamReader reader = new InputStr…… -
Java – how to disable playback 2.6 csrffilter
I was recently migrated to 2.6. When I called my API from the postman about filters, I got 403 replies At first, when …… -
Java: how to create a loop to create an array?
I need a lot of arrays, now I create them manually: int[] row1 = new int[3]; int[] row2 = new int[3]; int[] row3 = new…… -
Java – wicket – which ORM?
I am looking for an ORM that is easy to use and integrated for wicket applications I'm thinking about hibernate Is thi…… -
I can’t figure out my simple java homework
I have this programming task, which can convert between meters and feet, and between kilograms and pounds When I told …… -
Java – how to find the calling class?
How can I find out which class / method calls the actual method? Solution You can try to create an exception to get it…… -
How to change only Java net. Protocol part of URL object?
I have a Java. Net that uses HTTPS protocol net. URL object, for example: https://www.bla.com I only need to change th…… -
Java – why use the “this” keyword in constructors and setters?
Constructor is used to initialize a value and assign it to class variables when creating class instances, right? publi…… -
What is the best way to use hibernate’s detachedcriteria to limit results in Java?
I use hibernate 3.5.0 in Java 6-Final. Because I can't access hibernate session, I use detachedcriteria So, I want to …… -
Java – JSTL and time zone
I have some questions about the time zone We store all dates in UTC time, but we need to display some of them both in …… -
Java – why doesn’t my JFrame display?
I'm trying to display a solved Sudoku puzzle in a window with 81 boxes I did this: import java.awt.GridLayout; import …… -
Java – why does a function not have a parameterized return type because it has parameterized input?
This always forces us to return one parameter in case I need to return multiple, such as a list and a string There is …… -
Java – double counting that produces odd results
See English answer > is floating point math broken? 28 Solution Oh, I like these... These are caused by inaccuracie……